mb/supermicro/x11-lga1151-series: add x11ssh-f board as a variant

This adds another X11 series board, the X11SSH-F, which is similiar to
X11SSH-TF but differs in PCIe interfaces/devices, ethernet interfaces.

Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Change-Id: I92c32bff861f0b5697aea52ff282fae76b3b78ac
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45229
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

Documentation/mainboard/supermicro/x11-lga1151-series/x11ssh-f/x11ssh-f.md

@@ -0,0 +1,103 @@
+# Supermicro X11SSH-F
+
+This section details how to run coreboot on the [Supermicro X11SSH-F].
+
+## Flashing coreboot
+
+The board can be flashed externally. [STM32-based programmers] worked.
+
+The flash IC "W25Q128.V" (detected by flashrom) can be found near PCH PCIe Slot 4. It is sometime
+socketed, and covered by a sticker, hindering the observation of its precise model.
+
+It can be programmed in-system with a clip like pomona 5250.
+
+## BMC (IPMI)
+
+This board has an ASPEED [AST2400], which has BMC/[IPMI] functionality. The BMC firmware resides in a
+32 MiB SOIC-16 chip in the corner of the mainboard near the PCH PCIe Slot 4. This chip is a
+[MX25L25635F].
+
+## IGD
+
+If an IGD is integrated with CPU, it will be enabled on this board. Though there is no video output
+for it (The onboard VGA port is connected to BMC), it is said to be capable of being used for compute
+tasks, or for offloading graphics rendering via "muxless" [vga_witcheroo].
+
+## Tested and working
+
+- SeaBIOS payload to boot Kali Linux live USB
+- ECC ram (Linux' ie31200 driver works)
+- Integrated graphics device available without output
+- USB ports
+- Ethernet
+- SATA ports
+- RS232 external
+- PCIe slots
+- BMC (IPMI)
+- VGA on Aspeed
+- TPM on TPM expansion header
+
+## Known issues
+
+- See general issue section
+- S3 resume not working (vendor and coreboot)
+- SeaBIOS cannot make use of VGA on Aspeed (even if IGD is disabled)
+
+## ToDo
+
+- Fix known issues
+- Testing other payloads
+
+## Technology
+
+```eval_rst
++------------------+--------------------------------------------------+
+| CPU              | Intel Kaby Lake                                  |
++------------------+--------------------------------------------------+
+| PCH              | Intel C236                                       |
++------------------+--------------------------------------------------+
+| Coprocessor      | Intel SPS (server version of the ME)             |
++------------------+--------------------------------------------------+
+| Super I/O        | ASPEED AST2400                                   |
++------------------+--------------------------------------------------+
+| Ethernet         | 2x Intel I210-AT 1 GbE                           |
+|                  | 1x dedicated BMC                                 |
++------------------+--------------------------------------------------+
+| PCIe slots       | 1x 3.0 x8                                        |
+|                  | 1x 3.0 x8 (in x16)                               |
+|                  | 1x 3.0 x4 (in x8)                                |
+|                  | 1x 3.0 x2 (in M.2 slot with key M)               |
++------------------+--------------------------------------------------+
+| USB slots        | 2x USB 2.0 (ext)                                 |
+|                  | 2x USB 3.0 (ext)                                 |
+|                  | 1x USB 3.0 (int)                                 |
+|                  | 1x dual USB 3.0 header                           |
+|                  | 2x dual USB 2.0 header                           |
++------------------+--------------------------------------------------+
+| SATA slots       | 8x S-ATA III                                     |
++------------------+--------------------------------------------------+
+| Other slots      | 1x RS232 (ext)                                   |
+|                  | 1x RS232 header                                  |
+|                  | 1x TPM header                                    |
+|                  | 1x Power SMB header                              |
+|                  | 5x PWM Fan connector                             |
+|                  | 2x I-SGPIO                                       |
+|                  | 2x S-ATA DOM Power connector                     |
+|                  | 1x XDP Port (connector may absent)               |
+|                  | 1x External BMC I2C Header (for IPMI card)       |
+|                  | 1x Chassis Intrusion Header                      |
++------------------+--------------------------------------------------+
+```
+
+## Extra links
+
+- [Supermicro X11SSH-F]
+- [Board manual]
+
+[Supermicro X11SSH-F]: https://www.supermicro.com/en/products/motherboard/X11SSH-F
+[Board manual]: https://www.supermicro.com/manuals/motherboard/C236/MNL-1778.pdf
+[AST2400]: https://www.aspeedtech.com/products.php?fPath=20&rId=376
+[IPMI]: ../../../../drivers/ipmi_kcs.md
+[MX25L25635F]: https://media.digikey.com/pdf/Data%20Sheets/Macronix/MX25L25635F.pdf
+[STM32-based programmers]: https://github.com/dword1511/stm32-vserprog
+[vga_switcheroo]: https://01.org/linuxgraphics/gfx-docs/drm/gpu/vga-switcheroo.html